I have a Denon receiver, about a year old and

Isn't the answer always ventilation above and behind?

Which receiver, what is the nominal impedance of the speakers and how were they hooked up to the second zone of the receiver?

Absolutely lost!

It worked fine with my old receiver an onkyo.

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You don't say. He probably has no idea, which isn't a problem. Talking about ohms with someone (no offense at all, OP) who doesn't get electronics isn't productive to help them.

Always go for the simplest answer first.

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The simple answer MAY be ventilation but given the fault caused a load center issue with the breaker it is better to fully diagnose the fault especially when it takes a long time to reproduce. Denon receivers are not known to run hot like say a Onkyo so they work better in enclosed spaces. Asking the nominal impedance of the speaker gives a view into how much a person knows. If he doesn't know then I would ask the Brand and model and look it up myself. If one assumes like you did he doesn't understand the electrical properties of his system he may be presenting way too much of a load to the receiver. The answer may be as simple as ventilation but it may be as simple as he is running the speakers in series off a single amp and presenting too much of a load which can cause overheating even with adequate ventilation.

Denon AVRs have always run hot. There is a simple solution, though, if it is basic overheating issues.

LINK /

Get one of the aircom AVR coolers. There are several types. Be sure to get the one that exhaust air in the proper direction. If your AVR is in a cubby/space with a door in front, you need openings in the rear of the cubby and you want to get an aircom with rear discharge. If your AVR is in an open front cubby/space, you want to get an aircom with front discharge.

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I know you know this.

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I do. Another downfall is, if one of your speakers fails, they will all stop playing.

My best buddy and I dabbled in car audio in the late 80's - early 90's He was the first person I know that built isobaric/bandpass boxes. Wiring 2 4 or 8 speakers parallel or in series is easy to make the impedance work. 6, 10 or 12 not so much.

If I were the OP, the first thing I'd do is disconnect the speaker wires from the receiver and test the impedance of the system with a multimeter.

I know diddly squat about all this, but what works for me(8 speakers) is one of those impedance matching selector switch thingies. Each set is run to its own output. Never had an issue and I think it sounds great.